Cutter-bar for lawn-mowers



(No Model.) Y

W. C. ALLEN.

. QUTTER BAR FOR LAWN MOWERS. No. 545,934. Patented Sept. 10,1895.

HTT Y WILLIAM C. ALLEN, OF CAMBRIDGE, NEV YORK.

CUTTER-BAR FUR LAWN-MOWERS.

SPECIFICATION forming part Of Letters Patent N0. 545,934, dated September 10, 1895. Application filed October 12, 1892- Serial No. 448,620- (No model.)

To all whom it may concern:

Be it known that I, WILLIAM C. ALLEN, of Cambridge, in the county of Washington and State of New York, have invented a new and useful Improvement in Cutter-Bars for Lawn- Mowers, of which the following, taken in connection with the accompanying drawings,is a

- specification.

My improvement relates to that part of a lawn'mower termed the fixed or stationary cutter, against which the grass being out is pressed by the rotary cutters and the forward motion of the machine.

My invention consists in a flat steel cutterbar serrated on its front edge by alternate teeth and-notches extending obliquely backward from the upper to the lower surface of such edge, such bar having a longitudinal.

groove in its fiat upper surface extending from end to end along/the bases of said teeth to avoid friction of the revolving cutters on 'the bar behind the teeth, and'each tooth is preferably recessed in its upper surface for a similar purpose. Each tooth also has its up per surface beveled forwardly and downwardly substantially parallel with the curved path of the rotary cutters.

My improved cutter-bar is to be distinguished from those heretofore known formed by turning up obliquely and corrugating by dies the edge of a thin steel strip.

In the drawings, Figure 1 is a perspective view of one of my improved cutter-bars, and

Fig. 2'is a transverse section thereof, the curve shown denoting the arc of rotation of the rotary blades.

The cutter-bar A is a flat steel bar extending from end to end of the head of the mower and is to be bolted firmly in position to coact with the blades of the revolving cutter, which rotate in close prox mity to it or slightly touch ing it.

15 B are the teeth at the front edge of the rotation of the edges of the rotary cutters, thus securing accurate coaction between the said rotary cutters and the cutting-edges of the teeth. i

0 represents a longitudinal groove, formed in the upper surface of the barA and extending from end to end thereof behind and'adjacent to the series of teeth, to red ucefriction of the rotary blades or foreign matter upon the bar behind the teeth and to facilitate grinding the stationary cutter by the removal joiningthe surface to be ground. Each tooth is shown slightly recessed in its upper surface adjacent to said groove, as at D, for the same purpose.

In operation the blades of grass are forced by the forward motion of the machine and the action of the rotary cutters between the teethiof the fixed cutter-bar, where they are held from lateral displacement while being severed by said rotary cutters in conjunction with the sharpened edges of said teeth.

The. advantage of the beveled edge on my cutter-bar consists in the fact-that it admits of the bar being set far enough forward to cause the teeth to properly engage-the blades of grass near their roots and hold them on the proper cutting-line until sheared off, while at the same time it is not necessary to set the bar so far forward as to increase friction of the bar on the turf, and consequently increase the power required to run the machine. The ordinary plain bar, or a toothed bar which is not beveled, must be set so far forward to secure proper action of the cutting-edges that friction on the turf is greatly increased. If

it is sought to avoid such undue friction in thecase of a toothed bar not beveled, thebar has to be set so far back and also so tilted up to secure the propershearing'actionof the fell from the axis of rotation oi cutters. This location and adjustment of n. cutter her coi'zstructed as herein described secure thorough and absolutely reliable notion of the cutting-edges with close sheerin of the lawn and at the same time a lightness and of running never before attained in machines of this class. V

1 claim us my invention 1. A stationary cutter-her for lawn-movers consisting of n, let steel bar serrated on its front edge by alternate teeth and notches ere tending obliquely lmolicwnrd from the upper to the lower eun *o of snch'edge', and. formed with long roove or recess in its up iper surface sd incen t to the bases of said teeth, substantially as set forth.

2. A stationary matter-her for lawn-mowers, consisting of a that steel bar serrated on its from; edge by alternate teeth and notches tending obliquely backward from the np r to the lower surface of such edge, the nppc surfaces of such. teeth being; beveled out werdly and downwardly panelled with the arc of rotation of the rotary cutters, SlllJSlllltially as set forth.

3. A stationary cuttenhar for lnwnqnowers, consisting of a fiat steel serrated on its front edge by alternate teeth and notches extending obliquely backward from the upper menseto the lower surface of such edge, the upper faces of such teeth. being; beveled outwardly end downwerc ly parallel with the path of rotation of the rotary cutters, and the upper surface oi said her lie-ring a longitudinal groove or recess formed therein adjacent to the bases of said teeth, substantially as set forth.

A A stationary cutter-her for lcwirinowers, consisting of a tier steel. bar serrated on its front edge by alternate teeth and notches extending obliquely backward from the upper to the lower surface of such edge, the upper faces or? such teeth being beveled outwardly and downwardly parallel. with the path of ru ration of the rotary cutters, the upper surface of said her containing a longitudinal groove adjacent to the bases of said teeth, and the upper feoee of said teeth having; recesses or excavations formed therein adjacent to on opening into said groove, substantially as set forth.

In testimony whereof I have signed any name to this specification, in the preeence 0i. two subscribing Witnesses, on this 3d day of October, A. D. 1892.

WILLIAM. C. ALLEN.

Witnesses:

CLIFFORD HEWITT, O. LEAVENS ELnRn-noi; 

